Datasheet
ADS8634
ADS8638
SBAS541A –MAY 2011– REVISED AUGUST 2011
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Ch0LA MSB to Ch3HA LSB: Channels 0 to 3 Alarm Registers (Address = 04h to 23h; Page 1)
ADDRESS ON
REGISTER PAGE 1 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Ch0LA MSB 04h Ch0-LA Hysteresis[3:0] Ch0-LA[11:8]
Ch0LA LSB 05h Ch0-LA[7:0]
Ch0HA MSB 06h Ch0-HA Hysteresis[3:0] Ch0-HA[11:8]
Ch0HA LSB 07h Ch0-HA[7:0]
No function 08h to 0Bh X
(1)
X X X X X X X
Ch1LA MSB 0Ch Ch1-LA Hysteresis[3:0] Ch1-LA[11:8]
Ch1LA LSB 0Dh Ch1-LA[7:0]
Ch1HA MSB 0Eh Ch1-HA Hysteresis[3:0] Ch1-HA[11:8]
Ch1HA LSB 0Fh Ch1-HA[7:0]
No function 10h to 13h X X X X X X X X
Ch2LA MSB 14h Ch2-LA Hysteresis[3:0] Ch2-LA[11:8]
Ch2LA LSB 15h Ch2-LA[7:0]
Ch2HA MSB 16h Ch2-HA Hysteresis[3:0] Ch2-HA[11:8]
Ch2HA LSB 17h Ch2-HA[7:0]
No function 18h to 1Bh X X X X X X X X
Ch3LA MSB 1Ch Ch3-LA Hysteresis[3:0] Ch3-LA[11:8]
Ch3LA LSB 1Dh Ch3-LA[7:0]
Ch3HA MSB 1Eh Ch3-HA Hysteresis[3:0] Ch3-HA[11:8]
Ch3HA LSB 1Fh Ch3-HA[7:0]
No function 20h to 23h X X X X X X X X
(1) X = don't care.
Channel N HA/LA MSB Register
Bits[7:4] Chn-HA/LA Hysteresis[3:0]
These bits set the channel n high/low alarm hysteresis.
For example, bits[7:4] of the channel 2 HA MSB register (address 16h, page 1) set the channel 2 high alarm
hysteresis.
0000 = No hyeteresis
0001 = ±1LSB hystetesis
0010 to 1110 = ±2LSB to ±14LSB hystetesis
1111 = ±15LSB hystetesis
Bits[3:0] Chn-HA/LA[11:8]
These bits set the MSB nibble for the 12-bit channel n high/low alarm.
For example, the channel 3 high alarm threshold is AFFh when bits[3:0] of the channel 3 HA MSB register (address
1Eh, page 1) are set to Ah and the channel 3 HA LSB (address 1Fh, page 1) register setting is FFh.
0000 = MSB nibble is 0h
0001 = MSB nibble is 1h
0010 to 1110 = MSB nibble is 2h to Eh
1111 = MSB nibble is Fh
Channel N HA/LA LSB Register
Bits[7:0] Chn HA[7:0]
These bits set the LSB byte for the 12-bit channel n high/low alarm.
For example, the channel 1 low alarm threshold is F01h when the channel 1 LA LSB register (address 0Dh, page 1)
setting is 01h and bits[3:0] of the channel 1 LA MSB (address 0Ch, page 1) are set to Fh.
0000 0000 = LSB byte is 0h
0000 0001 = LSB byte is 1h
0000 0010 to 1110 1111 = LSB byte is 02h to EFh
1111 1111 = LSB byte is FFh
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